. The railroad and engineering journal . At the Kings Cross tunnel, experience has shownthat, besides a great saving of time, there has been a reduction,as compared with Ihe usual method, of about 50 per cent, in thecost of all that part of the work which is affected by the newmethod—that is, from the crown to the top sill of the face tim-bering, below which the work is executed in ih? ordinary man^ 96 THE RAILROAD AND [February, 1891. An Electrical Lighthouse.—The accompanving illustra-tion, which is from the report of United Slates Consul Connolly,of Auckland, New Zealand, to the State Depar
. The railroad and engineering journal . At the Kings Cross tunnel, experience has shownthat, besides a great saving of time, there has been a reduction,as compared with Ihe usual method, of about 50 per cent, in thecost of all that part of the work which is affected by the newmethod—that is, from the crown to the top sill of the face tim-bering, below which the work is executed in ih? ordinary man^ 96 THE RAILROAD AND [February, 1891. An Electrical Lighthouse.—The accompanving illustra-tion, which is from the report of United Slates Consul Connolly,of Auckland, New Zealand, to the State Department, shows alighthouse devised by Mr. Hannaford. a New Zealand is an Iron tower, with a windmill attached, which furnishespower to run the electric light, storage batteries being providedto equalize the power and secure a regular, uniform light at alltimes. The inventor describes its working as follows : The Hannaford light is in three tiers up to the revolvingcupola (which carries the lamp), but, although the lamp, of. course, revolves with the cupola, the arc within does not, but isalways broadside to one desired direction, the lens pulley at itsback facing (that is, the back of the lens) the land. Now, thelens has spring slides, which, when operated, send electricflashes that can be plainly discerned a distance of at least 30miles inland. Each set of flashes are different from each otherand represent the letters of the alphabet. An expert within thelighthouse can communicate to an expert many miles inlandanything of importance—a supreme value in the event of amarine disaster or in war time. Again, the arc can be bentdownward and upward, swayed to right or left, or all round thecompass, thus making it a great ocean searcher. Again, thearc is automatic, does its own lighting and extinguishment to anhour, a minute, or a second. The storage of electricity is sonovel that it is absolutely impossible to run short, even for anhour, of the full strength of the 15
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
